KR20060014843A - Wireless communication terminal having the function of flash bright regulation and its method - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a wireless communication terminal having a flash brightness control function and a method thereof.

2. The technical problem to be solved by the invention

The present invention automatically adjusts the brightness of the flash according to the ambient light (illuminance) without adding flash brightness control components (resistance, switching elements, control pins, etc.), thereby more accurately reflecting the ambient illumination value, thereby increasing the brightness of the flash. Its purpose is to provide a wireless communication terminal with a built-in camera that can control the flash brightness control method thereof.

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided a wireless communication terminal including a camera, comprising: illuminance detecting means for detecting illuminance around the camera; Storage means for storing a reference illuminance value; Control means for comparing the illuminance value detected by the illuminance detection means with a reference illuminance value stored in the storage means and outputting a 'brightness control signal whose pulse width is changed according to a signal level (voltage)'; Variable current adjusting means for varying the amount of applied current according to the signal level (voltage) of the brightness control signal of the control means; And light emitting means for receiving power and emitting light at a corresponding brightness according to a variable amount of applied current from the variable current adjusting means.

4. Important uses of the invention

The present invention is used in a wireless communication terminal.

Wireless communication terminal, Camera, Flash, Ambient light, Brightness control, Flash

Description

Wireless communication terminal having the function of flash brightness and its method {Wireless communication terminal having the function of flash bright regulation and its method}             

1 is a configuration diagram of an embodiment of a wireless communication terminal having a flash brightness control function according to the present invention;

2 is a flowchart illustrating a flash brightness adjusting method in a wireless communication terminal according to the present invention.

* Explanation of symbols for the main parts of the drawings

11: illuminance detection unit 12: control unit

13: DC / DC converter 14: light emitting unit

15: brightness controller 16: input unit

17: display unit 18: storage unit

19: distance measuring unit

The present invention relates to a wireless communication terminal having a flash brightness control function and a method thereof, and more particularly to the brightness of the flash without the addition of flash brightness control components (resistance, switching elements, control pins, etc.) The present invention relates to a wireless communication terminal with a built-in camera capable of automatically adjusting the level and a flash brightness adjusting method thereof.

The present invention also relates to a wireless communication communication terminal with a built-in camera that can be manually adjusted in macro shooting and the like in a dark space, and a flash brightness adjusting method thereof.

Macro photography refers to photography at a very close distance from the subject, for example, 30 cm or less. Most digital cameras have a special mode called macro mode, which is separate from the standard shooting mode. At very close range, the camera should behave a little differently because the focusing method is different from the normal picture. In a wireless communication terminal with a built-in camera, macro photography is possible.

Nowadays, from mobile pagers to cellular phones, personal mobile phones (PCS), IMT-2000 (International Mobile Telecommunication) and UMTS (Universal Mobile Telecommunication Service) based mobile communications in recent years The communication environment is developing at a tremendous speed, and along with the development of mobile communication terminals, the search for additional services available through the terminals is actively being developed.

In particular, the development of ultra-high speed mobile communication to IMT-2000 and UMTS, which is actively progressing at home and abroad, foretells the growth of data communication field using wireless network, and among these data communication areas, which are currently receiving the most attention. It is the transmission and reception of various information through the wireless Internet, and as the transmission speed of wireless data transmission and reception is improved, it is possible to transmit and receive images with large data sizes.

In addition, due to the development of hardware, communication terminal devices using the transmitted images are being developed. In recent years, a communication system is provided to provide the mobile communication speed so that there is no shortage of video transmission. It is a situation that is commercialized.

However, such a technology has a limitation in transmitting the image rather than transmitting the image through a wire in the case of wireless data transmission and reception. Depending on the various video coding methods, efforts have been made to improve the video quality compared to the communication speed on the receiving side by increasing the compression rate for unnecessary parts and slightly lowering the compression rate for important parts that interfere with the video. It may be a complex technical complement, such as a change in hardware applied with software.

However, in consideration of the movement characteristic, which is the biggest characteristic of the portable, the ambient brightness changes due to the change of the ambient lighting (or illuminance) according to the moving position. Not only that, but as you know, the ambient brightness changes with sunlight.

Therefore, when the user transmits the image of the subject obtained through the camera to the counterpart while the ambient illumination is lowered (that is, in a dark state), a clear image cannot be obtained from the position of the receiver receiving the image. In other words, an image of deteriorated image quality is transmitted from the image transmission step.

This problem of image quality deterioration exists from the subject imaging stage, and is not limited only to the transmission of the captured image, and even if it is stored (stored) in the terminal regardless of the transmission, the imaging of the surrounding illumination accurately reflected from the subject imaging stage Because of this difficulty, the above-mentioned problem still exists. Since the imaging of which the illuminance of the surroundings is accurately reflected from the subject imaging step is difficult, the problem of deterioration of image quality still exists.

Although conventional techniques exist that can improve image quality by automatically controlling the lighting device according to the ambient brightness (illuminance), but only when the brightness is higher than the reference value, the lighting device is turned off (i.e., lighting). If the brightness is less than the reference value, the device is turned ON (i.e., the device is turned on), and only the on / off of the lighting device is controlled according to the ambient brightness. Of course, as a more advanced technology, a technique for controlling the brightness of the lighting device according to the ambient brightness (illuminance) instead of simply turning on / off the lighting device according to the ambient brightness (illuminance) (hereinafter, Prior art exists, but the following problems exist.

The prior art is to adjust the brightness of the flash by connecting a resistor and a switching element to each PATH to give a different amount of current in hardware (hereinafter referred to as 'first prior art'), and the driver IC of the flash itself There is a method of controlling two-stage current using APPLICATION (hereinafter referred to as 'second prior art'). For example, it operates by setting about 200mA (lantern mode) and 500mA (flash mode).

The first prior art not only accurately reflects the ambient illuminance value in controlling the brightness of the flash, but also adds a resistor and a switching element each time the flash brightness level is increased one by one. In addition, the additional cost of the terminal and the lack of space on the PCB are caused by the addition of parts. That is, each time the flash brightness level is increased by one, a resistor, a switching element, and a control signal must be added one by one, thereby lowering the unit cost and PCB space utilization of the terminal.

In addition, the second prior art also does not reflect the ambient illuminance value more accurately in controlling the brightness of the flash, and also requires additional current control by applying an additional switching element to the pin allocated for current control. Addition is inevitable.

In the first and second prior arts, it is difficult to finely control the current flowing through the flash. Therefore, when the setting is decided during development, the consumer cannot arbitrarily control the desired brightness. If it bursts, the reflected light makes it impossible to take the desired close-up shot.

In particular, when the camera is photographed in the night macro mode, the flash fires a strong amount of light because the first and second prior arts are dark places. In this case, since strong light is reflected from the object (subject), the photographed picture is likely to be messed up. Although, in order to avoid this, the flash is continuously used in the lantern mode, but since the current flowing is about 300 mA at this time, a problem with a large amount of battery consumption is additionally generated.

Therefore, according to the first and second prior arts, the ambient illuminance value is not reflected more accurately in controlling the brightness of the flash, and the resistance, the switching element, and the control signal are added one by one each time the flash brightness level is increased. Since it must be, there is a problem that the cost increase of the terminal and utilization of PCB space is reduced. In addition, when shooting at night macro mode, although the flash can be used continuously in the lantern mode to solve the problem caused by the strong light reflection when shooting flash mode, there was a problem in that the additional battery consumption.

The present invention has been proposed to solve the above problems, and by automatically adjusting the brightness of the flash according to the ambient light (illuminance) without the addition of flash brightness control components (resistance, switching elements, control pins, etc.), An object of the present invention is to provide a wireless communication terminal with a built-in camera capable of controlling the brightness of a flash by more accurately reflecting an illuminance value of and a method of adjusting the flash brightness thereof.

In addition, the present invention provides a wireless communication communication terminal and a method of adjusting the brightness of the flash with a built-in camera that can reduce the power consumption (by low power loss) to be able to manually adjust in close-up photography in the dark space, etc. There is this.                         

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to an aspect of the present invention, there is provided a wireless communication terminal including a camera, comprising: illuminance detecting means for detecting illuminance around the camera; Storage means for storing a reference illuminance value; Control means for comparing the illuminance value detected by the illuminance detection means with a reference illuminance value stored in the storage means and outputting a 'brightness control signal whose pulse width is changed according to a signal level (voltage)'; Variable current adjusting means for varying the amount of applied current according to the signal level (voltage) of the brightness control signal of the control means; And light emitting means for receiving power and emitting light at a corresponding brightness according to a variable applied current amount in the variable current adjusting means.

In addition, the present invention further comprises an input means for manually adjusting the brightness of the light emitting means by transmitting a signal level (voltage) for determining the brightness of the light emitting means to the control means according to a user's request. It is characterized by.

In addition, the present invention transmits the distance measurement signal to the subject to be captured, calculates the time difference of the return signal from the subject to be captured, detects the distance to the subject to be captured and transmits it to the control means, It characterized in that it further comprises a distance measuring means for using the distance value with the subject when automatically adjusting the brightness of the light emitting means.

In addition, the present invention is characterized in that it further comprises a display means for screen display the radiation value (brightness step) of the light emitting means and / or the distance value to the subject to be captured.

On the other hand, the present invention is a wireless communication terminal provided with a camera, the illumination intensity detecting means for detecting the illuminance around the camera; Distance measuring means for transmitting a distance measuring signal to a subject to be imaged, calculating a time difference of a return signal from the subject to be imaged, and detecting a distance to the subject to be imaged; Storage means for storing a reference illuminance value / distance value; By comparing the illuminance value detected by the illuminance detecting means with the distance value measured by the distance measuring means, the reference illuminance value / distance value stored in the storage means is used to control the brightness of changing the pulse width according to the signal level (voltage). Control means for outputting a signal '; Variable current adjusting means for varying the amount of applied current according to the signal level (voltage) of the brightness control signal of the control means; And light emitting means for receiving power and emitting light at a corresponding brightness according to a variable applied current amount in the variable current adjusting means.

In addition, the present invention further comprises an input means for manually adjusting the brightness of the light emitting means by transmitting a signal level (voltage) for determining the brightness of the light emitting means to the control means according to a user's request. It is characterized by.

On the other hand, the present invention provides a flash brightness control method in a wireless communication terminal, the illuminance detection step of detecting the illuminance around the camera; After comparing the detected illuminance value and the pre-stored reference illuminance value, a 'brightness control signal whose pulse width is changed according to the signal level (voltage)' is generated, and 'flash' is generated according to the signal level (voltage) of the control signal. A first variable current application step of applying an amount of current to the device for adjusting the brightness of the first; And a variable light emission step of emitting light of the flash at a corresponding brightness according to the amount of current.

In addition, the present invention is characterized in that it further comprises a second variable current applying step of applying a current amount to the device according to the signal level (voltage) for determining the brightness of the flash according to the user's request.

The present invention enables flash brightness control according to ambient illumination (additional distance information to the subject may be additionally used) when photographing a subject in a wireless communication terminal equipped with a camera, and directly sets a desired flash brightness of the terminal user. Do it.

In particular, the present invention provides a brightness controller (eg, a junction transistor (NPN transistor, PNP transistor), a field effect transistor (FET, MOS FET)) without the addition of flash brightness control components (resistance, switching elements, control pins, etc.). While controlling the flash brightness step by step by applying a variable signal level (voltage) to the gate of the gate, etc., the brightness of the flash can be automatically controlled by more accurately reflecting the ambient illuminance value (+ distance from the subject). That is, as the brightness adjustment factor of the flash, not only the ambient illuminance value but also the distance value with the subject can be used.

At this time, the brightness of the flash can be changed automatically (stepwise change) according to the ambient light (illuminance) (additional distance from the subject) to increase battery life, and the terminal user can directly set the brightness of the flash. By enabling it, the flash can be fired weakly when taking close-ups in close-ups, so that not only a clearer image can be obtained from the subject image capturing step but also the battery consumption can be significantly reduced.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration of an embodiment of a wireless communication terminal having a flash brightness control function according to the present invention.

In the wireless communication terminal according to the present invention, there is provided a method of controlling the flash brightness according to the present invention (automatically controlling the flash brightness according to the ambient illumination (additional distance information with the subject may be additionally used) when photographing a subject (first embodiment), There is a method of manually controlling the flash brightness by directly setting the desired flash brightness of the terminal user (second embodiment).

However, in automatically controlling the flash brightness in the first embodiment, the brightness of the flash may be automatically changed step by step according to the ambient light (illuminance), and the distance value with the subject along with the ambient illumination value may be adjusted. In addition, it is noted that the brightness of the flash can be automatically changed by using it.

As shown in FIG. 1, a wireless communication terminal having a flash brightness adjusting function according to a first embodiment of the present invention stores an illumination intensity detector 11 for detecting an illumination intensity around a camera and a reference illumination value. Comparing the illuminance value detected by the illuminance detection unit 11 with the reference illuminance value stored in the storage unit 18 to determine the brightness control signal whose pulse width is changed according to the signal level (voltage). Control unit 12 for outputting ', brightness control unit 15 for varying the amount of applied current according to the signal level (voltage) of the brightness control signal of the control unit 12, the power supply, the brightness control unit And a light emitting portion 14 for emitting light at a corresponding brightness according to the variable applied current amount at 15. Further, the distance measuring signal is transmitted to the subject to be imaged, the time difference of the return signal from the subject to be imaged is calculated, and then the distance to the subject to be imaged is detected and transmitted to the controller 12, whereby the light emitting unit 14 The apparatus may further include a distance measuring unit 19 for using the distance value with the subject during automatic adjustment of the brightness. The display unit 17 further includes a display unit 17 for displaying the emission value (brightness level) screen of the light emitting unit 14.

In the first embodiment, when the distance value with the subject is additionally used in addition to the ambient illumination value, the storage unit 18 should store not only the reference illuminance value but also the reference distance value, and the control unit 12 By comparing not only the illuminance value detected by the sensing unit 11 but also the distance value measured by the distance measuring means, the reference illuminance value / distance value stored in the storage unit 18 is compared, and the pulse width is changed according to the signal level (voltage). By outputting the brightness control signal ', the brightness controller 15 changes the amount of applied current according to the signal level (voltage) of the brightness control signal and eventually light is emitted at the corresponding brightness according to the variable applied current amount in the light emitting unit 14. do.

On the other hand, according to the second embodiment, the wireless communication terminal having a flash brightness control function according to the present invention, the control unit 12 to control the signal level (voltage) for determining the brightness of the light emitting unit 14 according to the user's request In addition, the control unit further includes an input unit 16 for manually adjusting the brightness of the light emitting unit 14. This can be more useful when taking close-ups in dark places.

In the wireless communication terminal having the automatic flash brightness adjustment function according to the first embodiment of the present invention, in the normal mode according to the ambient brightness (illuminance), the ambient illuminance value is used whenever the user uses the camera mode (photo shooting mode). (And the distance value with respect to the subject to be imaged) are compared with the reference illuminance gain value (and distance gain value) to automatically and accurately control the brightness of the light emitting portion 14 more accurately.

Of course, in the first embodiment, the automatic flash brightness adjustment mode is set separately on the user menu or by using a shortcut key (for example, pressing and holding the "# " button) or separately on one side (up, down, left, right) or front and back of the terminal body. It can be set by pressing the set button.

Therefore, in the flash brightness automatic adjustment mode, the controller 12 operates the illuminance sensor (illumination sensor or camera sensor) 11 to generate an illuminance detection control signal so as to sense the ambient brightness, and according to the illuminance detection control signal. When the illuminance sensor (illumination sensor or camera sensor) 11 detects illuminance around the terminal and notifies the control unit 12 of the detected value (brightness value), the control unit 12 adjusts the brightness according to the brightness value (illuminance value). The brightness of the light emitting unit 14 is adjusted stepwise by controlling the amount of current applied to the gate of the adjusting unit 15.

In addition, when automatically adjusting the flash brightness, if the distance value with the subject is used, the control unit 12 operates the distance measuring unit (distance measuring sensor) 19 to detect the distance to the subject in the auto flash brightness adjusting mode. The distance detection control signal is generated so that the distance measurement sensor transmits the distance measurement signal to the object to be imaged to measure the distance to the object to be imaged in accordance with the distance detection control signal, and returns a signal from the object to be imaged. Subsequently, the distance measuring unit 19 calculates a time difference between the transmission signal transmitted from the distance measurement sensor to the object to be captured and the returned signal to calculate the distance to the object to be captured. The distance value to the subject to be captured is transmitted to the controller 12. Accordingly, the controller 12 may control the amount of current applied to the gate of the brightness controller 15 using the distance value as well as the brightness value (illuminance value), so that the brightness of the light emitter 14 may be more precisely adjusted in stages. .

The illuminance (and distance) gain table stored in the storage unit 18 is implemented by optimizing the brightness level of the light emitting unit 14 according to the peripheral illuminance value (and distance value with the subject).

On the other hand, the wireless communication terminal having the automatic flash brightness adjustment function according to the second embodiment of the present invention manually controls the brightness of the light emitting unit 14 according to the manual operation of the user.

Of course, in the second embodiment, the manual flash brightness adjustment mode may be performed separately on the user menu or by using a shortcut key (for example, by pressing and holding the "*" button), or by one side (up, down, left, right) or front and back of the terminal body. Can be set by pressing the set button.

Therefore, in the flash brightness manual adjustment mode, the controller 12 controls the amount of current applied to the gate of the brightness controller 15 in accordance with the brightness level adjustment value of the user to adjust the brightness of the light emitter 14 step by step.

In the first and second embodiments, the display unit 17 may not only display the emission value (brightness step) of the light emitting unit 14 on the screen but also display the distance value to the subject to be captured. Therefore, the user can accurately know the distance to the subject through the display value and can arbitrarily adjust (brighter or darker) the brightness. Of course, the brightness level of the light emitting unit 14 which is automatically obtained or manually operated by the control unit 12 and the distance to the subject to be captured may or may not be displayed on the display unit 17. However, it may be more preferable to display the brightness level (and distance to the subject) together for the convenience of the user.

Then, the flash brightness control process in the wireless communication terminal according to the first and second embodiments of the present invention will be described in detail.

According to the enable signal of the control unit 12, a light emitting unit (a flash, for example, a white LED, etc.) 14 is connected to a DC / DC converter 13 that outputs DC / DC battery power to an output port. And a brightness controller (switching element, for example, a junction transistor (NPN transistor, PNP transistor), field effect transistor (FET, MOS FET), etc.) 15 is connected thereto.

The brightness adjusting part (switching element) 15 can handle the electric current which flows into the light emitting part (flash) 14, and should just be an element which is guaranteed 1A or more. A pulse width modulation (PDM, PWM) signal whose pulse duration is changed in accordance with the signal level (voltage) provided by the controller 12 is provided at the gate end of the brightness adjusting unit (switching element) 15. Connect. This pulse width modulated (PDM, PWM) signal can be used as a general purpose input / output (GPIO) signal that can vary the voltage in 255 steps from 0V to 2.7V. At about 0.8V, the brightness adjusting part (switching element) 15 begins to turn on, and a small amount of current begins to flow in the light emitting part (flash) 14, and when it is about 1.2V or more, it turns completely on. ON) to allow maximum current to flow. Therefore, if the gate voltage is set according to the ambient brightness, up to 20 levels of control are possible.

Meanwhile, when the camera is photographed in the night macro mode, the light emitter 14 emits a strong amount of light because it is a dark place according to the first and second prior arts. In this case, since the strong light is reflected from the macro photography, the photographed picture is likely to be messed up. In order to avoid this, the light emitting unit (flash) 14 is continuously used in the lantern mode. Since the current flowing is about 300 mA, battery consumption is much increased. In order to solve this problem, if you control the flash brightness manually by using a hotkey or a designated key on the menu or by pressing a designated key, the flash may be fired with a weak amount of light that is not reflected to take a picture of a desired object.

2 is a flowchart illustrating a flash brightness adjusting method in a wireless communication terminal according to the present invention.

First, the terminal user can press a setting button set on the user menu or through a shortcut key (for example, press and hold the "#" button or the "*" button) or separately set on one side (up, down, left, right) or front and back of the terminal body. The automatic flash brightness adjustment mode or the manual flash brightness adjustment mode may be selected (201).

If it is set to the 'flash brightness automatic adjustment mode' (202), the control unit 12 operates the illumination sensor (illumination sensor or camera sensor) 11 to generate an illumination detection control signal to detect the ambient brightness. In response to the illuminance detection control signal, the illuminance sensor (illumination sensor or camera sensor) 11 detects illuminance around the terminal and notifies the control unit 12 of the detected value (brightness value) (203).

Subsequently, the controller 12 compares the illuminance value detected by the illuminance sensor 11 with the reference illuminance value stored in the storage unit 18 to determine the brightness control signal whose pulse width is changed according to the signal level (voltage). In step 204, the brightness adjusting unit 15 varies the applied current amount according to the signal level (voltage) of the brightness control signal of the controller 12 (205). That is, the controller 12 controls the amount of current applied to the gate of the brightness controller 15 according to the brightness value (illuminance value) obtained from the illumination sensor 11 to adjust the brightness of the light emitter 14 step by step. .

In addition, when the flash brightness is automatically adjusted, although not shown in the drawing, a distance value from the subject may be used. When the flash brightness automatic adjustment mode is set, the control unit 12 includes a distance measuring unit (distance measuring sensor). Operate (19) to generate a distance detection control signal to sense the distance to the subject, and the distance measuring sensor transmits the distance measurement signal to the subject to be imaged to measure the distance to the subject to be photographed according to the distance detection control signal. A signal is returned from the subject to be imaged.

Subsequently, the distance measuring unit 19 calculates a time difference between the transmission signal transmitted from the distance measuring sensor and the returned reception signal and calculates the distance to the imaging object. The distance value to the subject to be captured is transmitted to the controller 12. Therefore, the controller 12 may control the amount of current applied to the gate of the brightness controller 15 using the distance value as well as the brightness value (illuminance value) to gradually adjust the brightness of the light emitter 14.

On the other hand, if the 'flash brightness automatic control mode' is set (202), the control unit 12 controls the amount of current applied to the gate of the brightness control unit 15 according to the brightness level adjustment value of the user (206, 207) to emit light The brightness of the unit 14 may be adjusted step by step (208).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

As described above, the present invention can not only accurately reflect the ambient illumination value (and the position of the subject) in controlling the brightness of the flash, but also add the flash brightness control component (resistance, switching element, control pin, etc.). Multi-level automatic adjustment is possible (dividing the brightness level of the flash) and manual multi-level adjustment is possible for close-up shots in dark spaces, so you can not only get a clearer image in the subject image capture step, but also extend the battery life. There is an effect that can be extended.

Claims (11)

In a wireless communication terminal having a camera, Illuminance detecting means for detecting illuminance around the camera; Storage means for storing a reference illuminance value; Control means for comparing the illuminance value detected by the illuminance detection means with a reference illuminance value stored in the storage means and outputting a 'brightness control signal whose pulse width is changed according to a signal level (voltage)'; Variable current adjusting means for varying the amount of applied current according to the signal level (voltage) of the brightness control signal of the control means; And Light emitting means for receiving power and radiating light at a corresponding brightness according to a variable applied current amount in the variable current adjusting means Wireless communication terminal having a flash brightness adjustment function comprising a. The method of claim 1, Input means for manually adjusting the brightness of the light emitting means by transmitting a signal level (voltage) for determining the brightness of the light emitting means to the control means according to a user's request. Wireless communication terminal having a flash brightness adjustment function further comprising. The method according to claim 1 or 2, The variable current adjusting means, And a transistor for varying an amount of current according to a signal level (voltage) applied to a gate. The method of claim 1, The distance measurement signal is transmitted to the subject to be imaged, the time difference of the return signal from the subject to be imaged is calculated, the distance to the subject to be detected is detected and transmitted to the control means, thereby automatically brightness of the light emitting means. Distance measuring means to use the distance value from the subject when adjusting Wireless communication terminal having a flash brightness adjustment function further comprising. The method according to any one of claims 1 to 7, or 4, Display means for displaying a radiation value (brightness step) of the light emitting means and / or a distance value to the subject to be captured; Wireless communication terminal having a flash brightness adjustment function further comprising. In a wireless communication terminal having a camera, Illuminance detecting means for detecting illuminance around the camera; Distance measuring means for transmitting a distance measuring signal to a subject to be imaged, calculating a time difference of a return signal from the subject to be imaged, and detecting a distance to the subject to be imaged; Storage means for storing a reference illuminance value / distance value; By comparing the illuminance value detected by the illuminance detecting means with the distance value measured by the distance measuring means, the reference illuminance value / distance value stored in the storage means is used to control the brightness of changing the pulse width according to the signal level (voltage). Control means for outputting a signal '; Variable current adjusting means for varying the amount of applied current according to the signal level (voltage) of the brightness control signal of the control means; And Light emitting means for receiving power and radiating light at a corresponding brightness according to a variable applied current amount in the variable current adjusting means Wireless communication terminal having a flash brightness adjustment function comprising a. The method of claim 6, Input means for manually adjusting the brightness of the light emitting means by transmitting a signal level (voltage) for determining the brightness of the light emitting means to the control means according to a user's request. Wireless communication terminal having a flash brightness adjustment function further comprising. The method according to claim 6 or 7, The variable current adjusting means, And a transistor for varying an amount of current according to a signal level (voltage) applied to a gate. In the flash brightness control method in a wireless communication terminal, An illumination detection step of detecting an illumination around the camera; After comparing the detected illuminance value and the pre-stored reference illuminance value, a 'brightness control signal whose pulse width is changed according to the signal level (voltage)' is generated, and 'flash' is generated according to the signal level (voltage) of the control signal. A first variable current application step of applying an amount of current to the device for adjusting the brightness of the first; And A variable light emission step of emitting light of the flash at a corresponding brightness according to the amount of current Flash brightness control method in a wireless communication terminal comprising a. The method of claim 9, A second variable current applying step of applying a current amount to the device according to a signal level (voltage) for determining the brightness of the flash according to a user's request Flash brightness control method in a wireless communication terminal further comprising. The method according to claim 9 or 10, The device, A method of controlling flash brightness in a wireless communication terminal, characterized in that the transistor is a transistor whose current amount varies depending on the signal level (voltage) applied to the gate.

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